Improvement in wood-turning lathes



` N. T. MELvlN.

Wood-Turning Lathes.

No 154183 Patented Aug.18,1874.A

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UNITED STATES PATENT OFFICE.

NATHAN T. MELVIN, OF WEST SALEM, OHIO, ASSIGNOR OF ONE-HALF HIS RIGHT TO ISAAC HARBAUGH, OF SAME PLAGE.

IMPROVEMENT IN WOOD-TURNINGv LATHES.

Specification forming part of Letters Patent No. 154,183, dated August 18, 1874; applicationled June 10, 1874.

To all whom it may concern Be it known that I, NATHAN T. MELVIN, of West Salem, in the county of Wayne and State of Ohio, have invented certain new and useful Im provem ents in Wood-TurningLathes 5 and I do hereby declare that the following is a full, clear, and exact descriptionthereof, which will enable others skilled in the art to which it pertains to make and use the saine, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specication.

The nature of my invention consists in the construction and arrangement of a self-sharpening knife or bit for Wood-Working machines, as will be hereinafter more fully set forth.

In the accompanying drawing, Fig. 1 is a longitudinal vertical section of aturning-lathe, showing the position of my knife or bit therein. Fig. 2 is a side view of the knife. Fig. 3 is a longitudinal section of the same through the line x, Fig. 2.

A represents the knife or bit made in circular form for the Vgreatest part of its circumference, but on one side it has curves B B and C C, to form beads, &c. These curves may of course be made of any desired form or shape, according to the work to be done. The outting-edgea of this knife is first sharpened in the usual manner for turning-tools, then the edge is set or turned over to one side, as shown in Fi g. 3.

The effect of thus turning over the cuttingedge is to make the knife self-sharpening. No matter how long the knife is in use, or how many articles are turned, the last will be just as smooth as the rst, and the knife remain sharp till itis worn out.

The knife shown in the drawing is to be used in a turning-lathe, attached in a vertical position to a horizontal shaft, which shaft is retained stationaryT when any straight part is being turned, but revolvesin turning beads or curves, so as to bring the proper portions of the knife to the article being turned.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The knife A, made in circular form, provided with curves B C, and having its cutting-edge a turned over to oneside, all substantially as and for the purposes herein set forth.

In testimony that I claim the foregoing as my own I hereby affix my signature in pres-` ence of two witnesses.

NATHAN T. MELVIN. Witnesses:

IsAAo HARBAUGH, L. A. MARKHAM. 

